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HeyHey
kkg337
Heh - didn't mean to put the wind up you - sorry!
A lot of damp I'm old houses is not necessarily because they are old, but because over 100 years, people have done stuff to them without consideration for the appropriate materials.
That spray on acrylic render, for example, is quick, cheap and easy, but fails all the time, smd cannot be repaired properly. Failed impermeable render on a solid wall house is just as good as holding a permanent bucket of water against it.
The floor insulation could be a source of damp - if there is crap underneath the floor that breaches the DPC layer, that's a problem. Lifting and looking is the only real way to know.
When you say the DPC was done in 82 - is that the injection stuff? In which case, it doesn't really matter - it's still a bit rubbish.
I'd want to know what's going on at ground level in the adjoining ground at the front and back - is it built up, is it concreted, is there drainage, are there air bricks etc...
Also, are there any drains that might be cracked.